Overload electric switch or cut-out.



P. G VAN WUK.

OVERLOAD ELEm'mc swncn 0R CUT-OUT.

APPLICATION FILED NOV-11.1916.

Patented 0011.1,1918.

2 SHEETS-SHEET 2 fm'm.

ca Puma-Luna. WASNINGNN, DV 5 PETER GEBBTT VAN WIJ'K, OF GELDERMALSEN,NETHERLANDS.

OVEBLOAD ELECTRIC SWITCH OB, CUT-OUT.

Specification of Letters Patent.

Patented Oct. 1, 1918.

Application filed November 11, 1916. Serial No. 130,889.

To all whom it may concern Be it known that I, Pram Gmmrr VAN WIJK,subject of the Queen of the Netherlands, residin at Geldermalsen,Kingdom of the Nether ands, have invented new and useful Improvements inor relating to Overload Electric Switches or Cut-Outs; andI do herebydeclare the following'to be a full, clear, and exact description of thesame.

This invention relates to automatic overload electric switches. Theobject of this invention is to provide a switch in which it is possibleto regulate simply the retardation latter magnet is connected to theformer in series, in the second casein parallel. On being energized themagnet attracts a core or an armature which turns a spindle on which asecond action is exercised in the opposite direction by a spring orbalance weight.

The speed of rotation of the said spindle, and consequently the speed ofmovement of the core, can be regulated by alter-in the time ofoscillation of an escapement w ich,

' on the said'spindle being rotated by the of the spindle being actionof the core, is connected to the spindle by means of a coupling; thiscoupling doesnot however become operative in the event p thecircumference of the disk, is brought 0 posite the releasing member ofthe switc rotatedo'n the opposite direction by the action of the balanceweight The releasing member which is also controlled by a spring, isthus released and forced upward by the spring so that the switch isopened.

In the event of the overload discontinuing before the core of the timeswitch magnet has reached its outermost or end position, the said magnetis again short-circuited (or switched out) and the core or armature isreturned to its original position by the spring or balance weight.

A construction in which the two magnets are connected in series, isillustrated in the accompanying drawing in which- Figure 1 is a frontelevation,

Fig. 2 a longitudinal section on line AB of Fig. 1,

Fig. 3 a side elevation seen from the right in Fig. 1 and Fig. 4 a sideelevation seen from the left.

The switch 1 controlled in the known manner by a weight or a spring, islocked in the closed position by a releasing member 2-which, in thisposition, projects in front of a cross bar 3 between the levers 4 of theswitch. The upper end of the releasing member, provided with a roller 6,is forced by a helical spring 5 against the circumference of a disk 8secured to a horizontal spindle 7. The spindle 7 is rotatably supportedin two plates 9 and 10 of the frame or casing; on the spindle 7 ismounted a lever 11, the free end of which engages with a hook .14 of aspring-controlled pawl- 13 which prevents the lever 11 from being drawnback by a spring 15. When the pawl 13 is lifted in a manner hereinafterreferred to, the lever 11, underthe action of the spring 15, will swingout, so that the spindle 7 will be rotated, and the disk 8 brought intosuch a position that a recess 16 of the same will be opposite the roller6 at the upper end of the releasing member. pressed by the spring5 intothe said recess 16. so that the switch 1 will be released.

' The drawing back of the spring-controlled pawl is brought about by theenergizing of the electromagnet (time switch magnet) 17 which, on beingconnected up, attracts a core 18 adjustable in the central bore of themagnet, the said core beingsuspended by means of a. cord 19, chain orthe like, to the circumference of 'a pulley 20 provided at its Thelatter will be,

circumference with a groove 21 for the cord 19. The pulley 20 is mountedon a horizontal spindle 22 supported inthe a side "plates 9 and 1O;- Onthe" same spindle is further mounted a ratchet wheel 23 of anescapement. The anchor24 ofthe escapementis mounted on a separate'spiiidl'e 25 "on which" is also mounted a pendulum26 with an-ad--justable weight 27. on the spindle 22 is further mountedia pinion 28whichtransmits table on a pin 35, and in the normal position.

holds the lever 11 fast by means of the hook 14.

The dimensions are calculated so that approximately at the moment whenthe core 18 in its movement reaches the end position (attractedposition) the spindle 22, and 'accordingly also the too'thed'wheel 29,will have been turned so far that the'spring-con trolled pawl13"willhave-b'een completely raised by the'link 32, and will releasexthelever 11. The object of the slot 33 is toenable the toothed wheel 29 tobe brought back to the original position after the-apparatus has becomeoperative owing. to tli'e'maxirnum strength of current having beenexceeded for a certain time; the pawl 13 can be raised only owing to thearrangement of the'slot 33 in the link 32. A balance weight 36 has thetendency to turn the spindle 22 inth'e direction opposite to that ofthe'core'18'. To thatend .it is suspended by a core 37 or the lilfe to agrooved pulley 38*andsecx'1red to, the spindle 22.. This balance weight36' which couldalso be replaced'by a sprin has for its object to bringabout the return of the core 18 to its normal position, in the event oftheoverload failing to last so long that the core 18' reaches its end(attracted) position. As in that case the time switch magnet 17 is againout out, and accordingly deenergized, the core will be no longerattracted. The balance weight 36 will then rotate. the spindle 22 andraise the core 18 to the position which it originally occupied.

As during this turning back'of the spindle 22, the'ratchet wheel 23 ofthe device 'must not participate in the return movement, it is mountedon the spindle in a loosely rotatable manner, and T coupled to it onlyduring the direction of rotation which is given to the spindle'by theattracted core 18. This coupling is effected by. a spring controlledlocking pawl 39 providedon the ratchet wheel of the esc'apement andengaging with the teeth of a ratchet 'wheel 40 securedlto thespindle 22.When the spindle is turned back by the balance weight 36, thepawllfifihand will glide loosely over the ratchet teeth, the ratchet wheel 23 ofthe escapement remainin stationary.

lie. .energiz'in'g of the magnet. 17 takes place .in. the followingmanner:

Intothe inainicircuitisswitched a magnet coil 41 which, on beingenergized has the tendency'to-attract' arcore or an armature 43 inopposition to the action of a spring 42. On-thecore 43 is provided acontact bridg 44 which short-circuits two contacts 45 and 46' aslongasthe tension of the spring 42 remains greater than the force withwhich the core is attracted bythemagnet 41. The tensionoflthe spring 42can-beregulatedhy means offla nut 47, for the purpose of altering thestrengthof current at-which the core 43"opens the short-circuit betweenthe contacts 45 and Y46. The core .43 is provided with a. stop pin 48which, in the attracted position of the core, engages with fixed sto 49andtis uidedin slots provided in t c said stops (Tigs. 1 and 4).

In the construction shown in thedrawing, one pole of an electricconductor a leading to the electric installation, is connected to the.terminal b; current passesthrough the magnet coil 41, terminal a, wired,contact 45, contact bridge 44, contact 46, wire 9, contact fork h andthence further onthrou the switch 1. In case of an overland, t e shortcircuit 45, 46, 44 is destroyed, and the current passes over the wire a,magnet coil 17, contact piece 46, then over 9 and h to the switch. Themain current will pass accordin'gly. over the ma et 17, so thatthe core18 will be attr and the spindle 22 rotated with a speed determined bythe escapemen't device now coupled to the spindle In the event of theoverload disappearing lowest position, that is to say, before the switchis released in the manner described; as theaction ofjthe weight 36 isgreater than that exercised by the weight of the core 18, the formerwill prevail, and Will'turn the spindle22 with the parts connectedto it,back to the original position-H This return, movement does notjhoweverdepend on the escapement devicealone, as during the, turning back. 01 .1pindle. 2

by the weight. 36; the. Qllpli lg. 39; 40 will not be operativ andthemovementwill not be transmitted to the escapementv device. The return tothe position of, rest takes place-therefore with aconsiderableispeeflsothatithe. apparatus ,is automatically brought.

back. and i readyto. mkag iing Immediately after; eaChovetlOzid. I

, lE-gtitliev overload lasts longer thanthetime admis'slble forfthepunpose, thecut out will operate. In order to connect: the switch,a'gain,;the bar 2. is pulled down with: one

, fietthe crossbar 3 oitheswitchhas been moved into a position to engagebehind it, while with the other the lever 11 is turned.

out of the type having a magnet and a core cooperating therewith, thecombination of a spindle connected to said core so that when the core isattracted the spindle is rotated in one direction, means connected tosaid spindle for effecting rotation thereof in a reverse direction, anescapement, means for connecting said spindle and the escapement duringmovement of the spindle in one direction, a switch releasing member, andmeans operative by the travel of the core for releasing said member.

2. In an over-load electric switch or cutout of the type having a magnetand a core cooperative therewith, the combination of a spindle connectedtosaid core so that when the core is attracted the spindle is rotated inone direction, means connected to said spindle for effecting rotationthereof in a reverse direction, an escapement, means for connecting thespindle and the escapement during movement of the spindle in onedirection, a spring actuated member for releasing the switch, a notcheddisk for releasing said member, a spring-operated lever for turning saiddisk, and a pawl for retaining said lever, a link connected to saidpawl, and a wheel revolved by the spindle and arranged to operate saidlink.

3. In an over-load electric switch or cutout of the type having a magnetto govern the mechanism of the switch, a magnet in the main circuit togovern the operation of the first magnet, and cores in the magnets, thecombination of a spindle connected to one of said cores so that when thelatter is attracted the spindle is rotated in one direction, meansconnected to said spindle for effecting rotation thereof in a reverse direction, an escapement, means for connecting the spindle and theescapement during movement of the spindle in one direction, a member forreleasing the switch, and means operated by the travel of the coreconnected to said spindle for releasing said member.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

PIETER GERRIT VAN WIJK.

Witnesses:

THOMAS H. VERBAL, AL. BUNTA.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

